One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,14)(12,13)(15,16)(17,18)(19,27)(20,24)(21,25)(22,26)(23,30)(28,39)(29,45)(31,37)(32,48)(33,41)(34,42)(35,43)(36,44)(38,47)(40,46) involution — undirected(2,5)(6,8)(17,19,21,30)(18,23,25,27)(20,32,33,46)(22,28,35,31)(24,40,41,48)(26,37,43,39)(29,36,47,34)(38,44,45,42)(1,3,4,7)(2,6,5,8)(10,13)(14,16)(19,28)(20,33)(22,35)(23,37)(24,41)(26,43)(27,39)(29,46)(30,31)(32,47)(38,48)(40,45)(17,20,21,33)(18,24,25,41)(19,29,30,47)(22,36,35,34)(23,38,27,45)(26,44,43,42)(28,32,31,46)(37,40,39,48)(9,11,12,15)(10,14,13,16)(18,25)(23,27)(24,41)(26,43)(37,39)(38,45)(40,48)(42,44)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.